If you left it in the shed for a while, you are guaranteed to have condensation inside the unit. IT will kill it. it has happened to my PT 2 times already. Fortunately, Saris has been more than extremely good about reapairs and such, even out of warranty. Like Psimet said, give them a call. you are not going to get much help here beyond what you have already done.
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Arguing with ignorant people is an exercise in futility. They will bring you down to their level and once there they will beat you with their overwhelming experience.